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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Intangible Assets | Intangible assets are summarized as follows:
|  | December 31, |
|  | 2012 |  |  | 2011 |
($ in thousands) |  |  |  |  |  |
Definite-lived intangible assets: |  |  |  |  |  |  |  |
Investment contracts |  | $ | 197,704 |  |  | $ | 269,489 |
Accumulated amortization |  |  | (181,409 | ) |  |  | (249,809 | )
Definite-lived intangible assets, net |  |  | 16,295 |  |  |  | 19,680 |
Indefinite-lived intangible assets |  |  | 32,416 |  |  |  | 32,416 |
Total intangible assets, net |  | $ | 48,711 |  |  | $ | 52,096 |
Schedule of Activity in Goodwill and Other Intangible Assets | Activity in goodwill and other intangible assets is as follows:
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
($ in thousands) |  |  |  |  |  |  |  |  |
Intangible assets |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  | $ | 52,096 |  |  | $ | 52,977 |  |  | $ | 54,844 |
Purchases |  |  | 560 |  |  |  | 3,068 |  |  |  | 3,055 |
Amortization |  |  | (3,945 | ) |  |  | (3,949 | ) |  |  | (4,922 | )
Balance, end of period |  | $ | 48,711 |  |  | $ | 52,096 |  |  | $ | 52,977 |
Goodwill |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period |  | $ | 4,795 |  |  | $ | 4,795 |  |  | $ | 4,795 |
Acquisition |  |  | 465 |  |  |  | — |  |  |  | — |
Balance, end of period |  | $ | 5,260 |  |  | $ | 4,795 |  |  | $ | 4,795 |

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- Definition Summary Of Intangibles Assets Table [Text Block] + References No definition available. + Details
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